/*
 * Copyright 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package fuzion24.device.vulnerability.vulnerabilities.helper;

import android.content.Context;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.lang.reflect.Method;

/**
 * Utilities for accessing /proc filesystem information.
 */
public class SystemUtils {
    private SystemUtils() {
    }

    public static int ProcfindPidFor(String executable) throws IOException {
        File f = new File("/proc");
        for (File d : f.listFiles()) {
            String cmdLineString = d.getAbsolutePath() + "/cmdline";
            File cmdLine = new File(cmdLineString);
            if (cmdLine.exists()) {
                BufferedReader in = null;
                try {
                    in = new BufferedReader(new FileReader(cmdLine));
                    String line = in.readLine();
                    if ((line != null) && line.startsWith(executable)) {
                        return Integer.decode(d.getName());
                    }
                } finally {
                    if (in != null) {
                        in.close();
                    }
                }
            }
        }
        throw new RuntimeException("should never get here");
    }

    //https://stackoverflow.com/questions/2641111/where-is-android-os-systemproperties
    /**
     * Get the value for the given key.
     * @return an empty string if the key isn't found
     * @throws IllegalArgumentException if the key exceeds 32 characters
     */
    public static String propertyGet(Context context, String key) throws IllegalArgumentException {

        String ret= "";

        try{

            ClassLoader cl = context.getClassLoader();
            @SuppressWarnings("rawtypes")
            Class SystemProperties = cl.loadClass("android.os.SystemProperties");

            //Parameters Types
            @SuppressWarnings("rawtypes")
            Class[] paramTypes= new Class[1];
            paramTypes[0]= String.class;

            Method get = SystemProperties.getMethod("get", paramTypes);

            //Parameters
            Object[] params= new Object[1];
            params[0]= new String(key);

            ret= (String) get.invoke(SystemProperties, params);

        }catch( IllegalArgumentException iAE ){
            throw iAE;
        }catch( Exception e ){
            ret= "";
            //TODO
        }

        return ret;

    }

}